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6. Command Specification
This clause includes all supported and unsupported SCSI commands. Elements of this clause come from clauses 7,
8 and 9 of the ANSI X3T9.2, SCSI interface specification.
There are different types of SCSI commands, each with a specific, required length (in bytes.) The majority of the
commands are 6 byte Group 0 commands. Group 1 & 2 commands are 10 bytes long. Note that the drive will wait
until the required number of bytes are transferred. At the termination of each command, the target sends a status
byte to the initiator. See the clause on Status for more details. The following is a list of the supported SCSI
Commands and page index:
PARA
SCSI COMMAND
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
6.16
6.17
6.18
6.19
6.20
6.21
6.22
6.23
6.24
6.25
6.26
6.27
6.28
6.29
6.30
6.31
Note: In compliance with the SCSI specification, the unit will terminate the command with a CHECK CONDITION
status and the sense key will be set to ILLEGAL REQUEST when a reserved bit, byte, field or code is not ZERO.
The unit has an embedded SCSI controller interface and therefore is a single target, single logical unit device when
on the SCSI bus. The Logical Unit Number for the drive is fixed and is set to ZERO. In order to be SCSI-2
compatible, the following scheme is used to check the LUN:
SCSI-2 states that the LUN addressed by the host should appear in the IDENTIFY message sent to the target on
selection. If SDX-250V receives an IDENTIFY message with a LUNTRN field of ZERO, then it will not check the LUN
field in the CDB (ANSI have reserved the right to reclaim the LUN field in the CDB in the next release of SCSI and
has recommended that this field not be used in SCSI-2 compatible devices). However, SCSI-1 and SCSI-2 devices
are allowed to coexist on the same bus, and SCSI-1 hosts will not send an IDENTIFY message. If SDX-250V does
NOT receive an IDENTIFY message on selection then it WILL check the LUN field in the CDB and expect it to be
ZERO. If it isn't the unit will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
Table 6-1: SCSI Commands and Page Index
6.Command Specification
OP CODE
PAGE
6-2
6-3
6-8
6-9
6-10
4Dh
6-12
6-26
6-41
6-44
6-48
6-50
6-51
6-53
6-54
6-56
6-58
6-60
6-61
6-63
6-64
6-65
6-73
6-74
6-75
6-76
6-78
6-81
6-82
6-84
6-86
6-88
6-1
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